15 of 21 INST.21
Clean the electrode in a mild detergent solution. Wipe the
probe with a soft tissue paper. Avoid touching the glass
membrane with your fingers. Wash thoroughly in tap water
and then in distilled water. Recalibrate the meter after
cleaning the electrode.
6
TROUBLESHOOTING
Problem
Cause
Solution
Power ON but no Display
a) Batteries not in place.
a) Insert batteries.
b) Re-insert batteries in
correct polarity.
‘LO’ displays in the LCD
a) Low battery.
a) Replace batteries with
fresh ones.
Unstable Reading
a) Electrode not deep
enough in sample.
b) Dirty electrode.
c) Broken electrode.
a) Place electrode deeper in
sample.
b) Clean electrode and recali-
brate.
c) Replace electrode.
‘Er1’ Display
a) Buffer value out of
tolerance.
a) Use new buffer solution
and recalibrate.
Not able to Calibrate
a) Display freezes.
b) Faulty electrode.
a) Release reading by
pressing HOLD key.
b) Replace electrode.
